LXR uboot/arch/sparc/include/asm/io.h

   1/* SPARC I/O definitions
   2 *
   3 * (C) Copyright 2007
   4 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License as
   8 * published by the Free Software Foundation; either version 2 of
   9 * the License, or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  19 * MA 02111-1307 USA
  20 *
  21 */
  22
  23#ifndef _SPARC_IO_H
  24#define _SPARC_IO_H
  25
  26/* Nothing to sync, total store ordering (TSO)... */
  27#define sync()
  28
  29/* Forces a cache miss on read/load.
  30 * On some architectures we need to bypass the cache when reading
  31 * I/O registers so that we are not reading the same status word
  32 * over and over again resulting in a hang (until an IRQ if lucky)
  33 *
  34 */
  35#ifndef CONFIG_SYS_HAS_NO_CACHE
  36#define READ_BYTE(var)  SPARC_NOCACHE_READ_BYTE((unsigned int)(var))
  37#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)(var))
  38#define READ_WORD(var)  SPARC_NOCACHE_READ((unsigned int)(var))
  39#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)(var))
  40#else
  41#define READ_BYTE(var)  (var)
  42#define READ_HWORD(var) (var)
  43#define READ_WORD(var)  (var)
  44#define READ_DWORD(var) (var)
  45#endif
  46
  47/*
  48 * Generic virtual read/write.
  49 */
  50#define __arch_getb(a)                  (READ_BYTE(a))
  51#define __arch_getw(a)                  (READ_HWORD(a))
  52#define __arch_getl(a)                  (READ_WORD(a))
  53#define __arch_getq(a)                  (READ_DWORD(a))
  54
  55#define __arch_putb(v,a)                (*(volatile unsigned char *)(a) = (v))
  56#define __arch_putw(v,a)                (*(volatile unsigned short *)(a) = (v))
  57#define __arch_putl(v,a)                (*(volatile unsigned int *)(a) = (v))
  58
  59#define __raw_writeb(v,a)               __arch_putb(v,a)
  60#define __raw_writew(v,a)               __arch_putw(v,a)
  61#define __raw_writel(v,a)               __arch_putl(v,a)
  62
  63#define __raw_readb(a)                  __arch_getb(a)
  64#define __raw_readw(a)                  __arch_getw(a)
  65#define __raw_readl(a)                  __arch_getl(a)
  66#define __raw_readq(a)                  __arch_getq(a)
  67
  68/*
  69 * Given a physical address and a length, return a virtual address
  70 * that can be used to access the memory range with the caching
  71 * properties specified by "flags".
  72 */
  73
  74#define MAP_NOCACHE     (0)
  75#define MAP_WRCOMBINE   (0)
  76#define MAP_WRBACK      (0)
  77#define MAP_WRTHROUGH   (0)
  78
  79static inline void *map_physmem(phys_addr_t paddr, unsigned long len,
  80                                unsigned long flags)
  81{
  82        return (void *)paddr;
  83}
  84
  85/*
  86 * Take down a mapping set up by map_physmem().
  87 */
  88static inline void unmap_physmem(void *vaddr, unsigned long flags)
  89{
  90
  91}
  92
  93static inline phys_addr_t virt_to_phys(void * vaddr)
  94{
  95        return (phys_addr_t)(vaddr);
  96}
  97
  98#endif
  99